The other thing is raising minimum wage and making sure that employers aren't dodging labour standards with e.g. contract and part-time employees filling what are really permanent, full-time positions.

You have a point, but are there really 20 different kinds? Here we basically have two: unemployment and disability.

Oh yes, job-seekers (formerly unemployment), carers, disability, attendance, bereavement, child benefit and so on...up to about fifty*

There's no denying that it could be simplified. Like many systems in this great nation, benefits have proliferated and grown as did the proverbial African American child in the story by Mrs. Beecher Stowe.

However, the jump from many to one is plain ridiculous.

*that may be an exaggeration

It all boils down to the same thing: needs income support.